Geologic map and map database of the Palo Alto 30' X 60' quadrangle, California

This digital map database, compiled from previously published and unpublished data, and new mapping by the authors, represents the general distribution of bedrock and surficial deposits in the mapped area. Together with the accompanying text file (pamf.ps, pamf.pdf, pamf.txt), it provides current information on the geologic structure and stratigraphy of the area covered. The database delineates map units that are identified by general age and lithology following the stratigraphic nomenclature of the U.S. Geological Survey.

The scale of the source maps limits the spatial resolution (scale) of the database to 1:62,500 or smaller. The attached text file mf2332.rev contains current revision numbers for all parts of this product. This report consists of a set of geologic map database files (Arc/ Info coverages) and supporting text and plotfiles.

In addition, the report includes two sets of plotfiles (PostScript and PDF format) that will generate map sheets and pamphlets similar to a traditional USGS Miscellaneous Field Studies Report. These files are described in the explanatory pamphlets (pamf.ps, pamf.pdf, pamf.txt). The base map layer used in the preparation of the geologic map plotfiles was scanned from a scale-stable version of the USGS 1:100,000 topographic map at a resolution of 300 dpi as a monochrome TIFF image.

The raster data was converted to a GRID in Arc/Info, and combined with geologic polygon data to produce the final map image. The base map coverages included with the database publication are vectorized versions of scans of scale-stable seperates. These coverages contain no database information other than position, and are included for reference only.

In both cases the map digitized was the Palo Alto (1982 version) 1: 100,000 quadrangle, which has a 50-meter contour interval.